Continuing the development of Opera 12, Norwegian browser maker has recently released a new build which features a full ECMAScript (JavaScript) 5.1 support and few other goodies.

According to Wikipedia, Opera 12.00 pre-alpha (build 1065) fails only at 5 out of 10978 tests which is slightly better than IE10 PP2 as it scored 7/10935.
As for other web browsers, Firefox 9.0a1 failed scored 168/10978 tests while Google Chrome 15.0.874.12 failed at 413 out of 10978 tests.

In case you are using Windows 8 Developer Preview with IE10 Platform Preview 3, feel free to run this test and let us know the results.

For a complete list of changes and download links, visit the following page.

Vygantas is a former web designer whose projects are used by companies such as AMD, NVIDIA and departed Westood Studios. Being passionate about software, Vygantas began his journalism career back in 2007 when he founded FavBrowser.com. Having said that, he is also an adrenaline junkie who enjoys good books, fitness activities and Forex trading.

No, Opera said that only about the one test that already is confirmed to be invalid (https://bugs.ecmascript.org/show_bug.cgi?id=179). They didn’t say anything about other four, but they seem to be invalid since they’re based on assumption that isn’t clarified anywhere in the spec (all test pretty much the same thing).

No its not I know Google’s Sputnik test was added to it & Mozilla have been part of it from the beginning 1997.
I would agree Microsoft use everything as a marketing tool & are very good at cherry picking the bits that suit them